python - 使用 prefetch_related 计数注释

Question

编辑：以下两个片段实际上运行良好，没有错误！这是我代码库中其他地方的错字。

有没有办法编写 ORM 调用，以便我可以获得 ManyToMany 对象的计数注释并 prefetch_related 那些对象？

例如

movies = Movies.objects.filter()
movies = movies.annotate(genre_count=Count('genre'))
movies = movies.prefetch_related('genre_set')

for movie in movies:
    genres = movie.genre_set.all()
    genre_count = movie.genre_count

这会引发 AttributeError: 'Movie' object has no attribute 'genre_count'，而

movies = Movies.objects.filter()
movies = movies.annotate(genre_count=Count('genre'))

for movie in movies:
    genre_count = movie.genre_count

工作正常